Roughcast / pebbledash garage repair - Need help with render /cement ratios

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Hi all,

I am currently doing up my garage and plan on painting my garage with masonry paint but first I need to repair my garage since part of the roughcast/pebbledash panel has broken off. I am going to remove any loose bits with my chisel and then pebbledash a layer over it, it doesn't have to be too pretty since it's getting painted.

I really need help with the mixture, so I am wondering if anyone else has done this.

I already have the pebbles.
Do I do a base layer, let it dry and then do another layeer and then pebbledash it?

What do I use for the render/cement mixture. Does anyone know the ratios and is it just a 25kg standard multipurpose bag of cement from b&q?
I will be mixing by hand using a paddle mixer since I don't have a cement mixer.

Many thanks
 

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